for loop help?

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for loop help?

 
0
  #1
Oct 22nd, 2009
I have this code:
Java Syntax (Toggle Plain Text) 
  1. /*
  2.  
  3. package lab;
  4.  
  5.  
  6. public class Main {
  7.  
  8.    
  9.     public static void main(String[] args) {
  10.         int t=0;
  11.         int h=0;
  12.         int w=0;
  13.         String Name="http://hcmiu.edu.vn/mail/cuem";
  14.         char[] ch=new char[Name.length()];
  15.         for(int i=0;i<Name.length();i++){
  16.             ch[i]=Name.charAt(i);
  17.              for(int j=0;j<Name.length();j++){
  18.             if((ch[j]=='/')&&(ch[j+1]=='/')&&(Character.isLetter(ch[j+2]))){
  19.                 t=j+2;
  20.                 System.out.println(t);
  21.                  h=Name.indexOf('/', j+3);
  22.                 
  23.             }
  24.             
  25.              }
  26.              
  27.         }
  28.         System.out.println(Name.subSequence(t, h));
  29.     }
  30.  
  31. }
  32.  
This code run correctly.But when i dont use the second for loop.i couldnt work.I dont know? plz give me the answer.
Java Syntax (Toggle Plain Text) 
  1. /*
  2.  
  3.  
  4. package lab;
  5.  
  6. public class Main {
  7.  
  8.   
  9.     public static void main(String[] args) {
  10.         int t=0;
  11.         int h=0;
  12.         int w=0;
  13.         String Name="http://hcmiu.edu.vn/mail/cuem";
  14.         char[] ch=new char[Name.length()];
  15.         for(int i=0;i<Name.length();i++){
  16.             ch[i]=Name.charAt(i);
  17.             
  18.             if((ch[i]=='/')&&(ch[i+1]=='/')&&(Character.isLetter(ch[i+2]))){
  19.                 t=o+2;
  20.                 System.out.println(t);
  21.                  h=Name.indexOf('/', j+3);
  22.                 
  23.             }
  24.             
  25.                    
  26.         }
  27.         System.out.println(Name.subSequence(t, h));
  28.        
  29.     }
  30.  
  31. }
  32.  
Why do i need the second for loop?
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Join Date: Nov 2008
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0
  #2
Oct 22nd, 2009
Second code:
Line 19: o ???
Line 21: j ???

Read compile errors.
Last edited by quuba; Oct 22nd, 2009 at 10:56 am.
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0
  #3
Oct 22nd, 2009
line 19: 0=j
line 21: replace j =i
sorry i type incorrectly.
So now,could you run and show me why its wrong.thanks
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1
  #4
Oct 22nd, 2009
In one loop
for(int i=0;i<Name.length();i++){
ch[i] = Name.charAt(i);
.....
}
for current i , are only defined values ch[0]......ch[i-2]..ch[i-1]...ch[i]
but no ch[i+1] or ch[i+2] .They will set in the the future course of the loop.
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0
  #5
Oct 22nd, 2009
Oh.i understand now.Thanks for your help.
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